JPH0326020Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an exhaust system for a motor vehicle, particularly a rear engine rear drive vehicle.

Conventionally, it was used as an exhaust system for automobiles in 1983.
2 of the muffler, like the one described in No. 51624.
A device is known in which the part is elastically supported on the vehicle body side so that it can be stably attached to the vehicle body side. On the other hand, exhaust systems having a catalytic converter are generally used, but in the conventional exhaust system described above, no consideration was given to supporting the catalytic converter on the vehicle body side of a rear-engine, rear-drive vehicle.

The present invention was developed in view of the above-mentioned circumstances, and has a large degree of freedom in the installation position of the catalytic converter in rear-engine rear-drive vehicles, allowing the catalytic converter to be housed in the space behind the transmission. The object of the present invention is to provide an exhaust system in which the heat is not transmitted to the catalytic converter or the muffler, the noise is low, and the temperature does not easily rise even in the event of a misfire.

In order to achieve this objective, the present invention, in the exhaust system of a rear-engine rear-drive vehicle, arranges a catalytic converter along the width direction of the vehicle body in the axial direction, and also arranges a muffler along the front-rear direction of the vehicle body. and the catalytic converter and the muffler are flange-coupled or integrally coupled, and two points in the longitudinal direction of the muffler are located on a line extending in the longitudinal direction passing through an upper part near the center of gravity of the converter and near the center of gravity of the muffler. The catalytic converter and the muffler are elastically supported on the vehicle body side so that the total center of gravity of the catalytic converter and the muffler is located inside the three elastic supporting members in plan view, and the exhaust gas between the catalytic converter and the engine is It is characterized in that a portion of the passage is constructed from a flexible bellows-shaped pipe.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a vehicle body of a rear-engine rear-drive vehicle, and an engine 2 is disposed on one side in the width direction at the rear of the vehicle body 1, and a transmission 3 connected to the engine 2 is disposed on the other side. , from the rear of the transmission 3, the exhaust manifold 2a of the engine 2.
The rear surface protrudes backwards. The upstream end of an exhaust pipe 5 constituting the upstream part of the exhaust passage 4 is connected to one side of the exhaust manifold 2a by a flange, and the exhaust pipe 5 is bent upward and backward and reversed, and the downstream end of the exhaust pipe 5 is connected to the downstream end of the exhaust pipe 5. The upstream ends of the bellows-shaped pipes 6 constituting the section are connected. The bellows-shaped pipe 6 is made of an elastic metal such as stainless steel, has flexibility, and extends in the width direction of the vehicle body 1. The upstream end of a catalytic converter 7 is connected to the downstream end of the bellows-shaped pipe 6 by a flange. The catalytic converter 7 is disposed behind the transmission 3 with its axial direction running along the width direction of the vehicle body 1, and an inlet pipe 8a of a muffler 8 is flange-connected to the downstream end of the catalytic converter 7. The muffler 8 is arranged on the opposite side of the engine 2 of the transmission 3, with its axial direction along the longitudinal direction of the vehicle body 1, and the upstream end of the tail pipe 9 is connected to the front end surface of the muffler 8, and the tail pipe 9 is located at the lower rear. The muffler 8 is curved and inverted, and opens rearward from the rear end of the muffler 8.

A bracket 10 is fixed to the upper part of the catalytic converter 7 near the center of gravity GC.
is fixed via a mount rubber 11 to a stay 12 provided on the lower surface of the center in the width direction of the vehicle body 1, so that the catalytic converter 7 is elastically supported at one location on the vehicle body 1 side. A bracket 13 is fixed to the front end surface of the muffler 8, and a bracket 14 is fixed to the rear end surface of the muffler 8.
The stay 1 is installed on the center side and the other side of the vehicle body 1 in the vehicle width direction via the mount rubbers 15 and 16.
7 and 18, respectively, and a muffler 8 is elastically supported at two locations on the vehicle body 1 side. The mound rubbers 15 and 16 are arranged on a line l passing near the center of gravity of the muffler 8. By elastically supporting the muffler 8 at two points on the line l passing near the center of gravity G _M on the vehicle body 1 side, the combined center of gravity of the muffler 8 and the catalytic converter 7, that is, the total center of gravity _G Support points 11, 15, 16
Go inside the triangle that connects.

The exhaust system of the embodiment configured as described above has the following features:
Exhaust gas from the engine 2 is guided from the exhaust manifold 2a through the exhaust pipe 5 and the bellows-shaped pipe 6 to the catalytic converter 7, where harmful components are purified and guided to the muffler 8, where the noise is muffled and the tail pipe 9
and is discharged into the atmosphere through its opening.

In this embodiment, the catalytic converter 7 and the muffler 8 are flange-coupled, and the center of gravity of the converter 7 is
The total center of gravity of the muffler 8 and the catalytic converter 7 is elastically supported on the vehicle body 1 side using mount rubbers 11, 15, and 16 at one upper part near the GC and two locations on a line passing near the center of gravity GM of the muffler 8.
G _T is the center of gravity G _M of the muffler 8 and the catalytic converter 7
It is located on the line connecting the center of gravity G _C of , and at the point divided internally in inverse proportion to each weight. Since the muffler 8 and catalytic converter 7, which have the total center of gravity _GT at such a position, are supported at three points, the forces in the longitudinal, lateral, and vertical directions that act on the total center of gravity GT and the forces generated around the total center of gravity _GT The muffler 8 and the catalytic converter 7 are supported at a distance from the total center of gravity _GT to withstand moments such as pitching, yawing, and rolling. Therefore, the mount rubber 11,1
The force acting on the elastic members 5, 16, etc. is reduced, and the elastic members and/or supporting members can be made smaller and lighter. Moreover, the support itself becomes stable.

Moreover, there is a large degree of freedom in the mounting position of the catalytic converter, and it can be installed using the space behind the transmission 3, so there is no wasted space. Also,
Vibration from the engine 1 side causes mount rubber 1
1, 15, and 16 and by providing a flexible bellows-shaped pipe 6 in a part of the exhaust passage 4 upstream of the catalytic converter 7, the information is not transmitted to the catalytic converter 7 and the muffler 8. This is advantageous in terms of strength, the converter 7 and muffler 8 can be connected by a single pipe, and furthermore, radiated noise is small, which is advantageous in terms of noise in rear engine vehicles. Even in a misfire state, the bellows-shaped pipe 6 has a large heat dissipation area, so it is possible to suppress an excessive rise in temperature, and there is little adverse effect on strength due to heat, and the bellows-shaped pipe 6
The length of can be short.

In the embodiments described above, the catalytic converter and the muffler are connected by a flange, but they may be connected integrally.

As explained above, according to the present invention, a catalytic converter and a muffler are combined, one part of the catalytic converter and two parts of the muffler are elastically supported on the vehicle body near the center of gravity, and the catalytic converter is elastically supported at two parts near the center of gravity. By providing a flexible bellows-shaped pipe on the engine side, the elastic material and supporting material can be made smaller and lighter, and the catalytic converter can be stored in the space behind the transmission of a rear engine rear drive vehicle. Since engine vibrations are not transmitted to the catalytic converter and muffler, this is advantageous in terms of strength and noise, and even in the event of a misfire, there is less adverse effect on strength due to heat.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of an automobile equipped with an exhaust system according to an embodiment of the invention, Fig. 2 is a schematic plan view of an embodiment of the invention, Fig. 3 is a schematic rear view of the same, and Fig. 4 is a schematic side view of an automobile equipped with an exhaust system according to an embodiment of the invention. The same schematic side view, FIG. 5 is a partial explanatory view taken in the direction of arrows in FIG. 3. DESCRIPTION OF SYMBOLS 1...Vehicle body, 2...Engine, 2a...Exhaust manifold, 3...Mission, 4...Exhaust passage, 5...Exhaust pipe, 6...Accordion-shaped pipe, 7...
Catalytic converter, 8...muffler, 8a...inlet pipe, 9...tail pipe, 10, 13, 14...
Bracket, 11, 15, 16...Mount rubber, 12, 17, 18...Stay.

Claims (1)

[Scope of utility model registration request] In the exhaust system of rear engine rear drive vehicles,
A catalytic converter is disposed axially along the width direction of the vehicle body, a muffler is disposed along the longitudinal direction of the vehicle body, and the catalytic converter and the muffler are flange-coupled or integrally coupled, so that the center of gravity of the converter The total center of gravity of the catalytic converter and the muffler is determined by the elasticity of the three locations when viewed from above at two locations in the longitudinal direction of the muffler that are on a line extending in the longitudinal direction that passes through one upper location and the center of gravity of the muffler. The exhaust gas is elastically supported on the vehicle body side so as to be located inside the support member, and a part of the exhaust passage between the catalytic converter and the engine is formed of a flexible bellows-shaped pipe. Device.